/DemiBlog/lib/arc/store/ARC2_MemStore.php
PHP | 198 lines | 147 code | 25 blank | 26 comment | 34 complexity | a698cae674f62481f3b25115d78ed171 MD5 | raw file
Possible License(s): GPL-2.0
- <?php
- /**
- * ARC2 Memory Store
- *
- * @author Benjamin Nowack <bnowack@semsol.com>
- * @license http://arc.semsol.org/license
- * @package ARC2
- * @version 2009-08-13
- */
- ARC2::inc('Class');
- class ARC2_MemStore extends ARC2_Class {
- function __construct($a = '', &$caller) {
- parent::__construct($a, $caller);
- }
-
- function ARC2_MemStore($a = '', &$caller) {
- $this->__construct($a, $caller);
- $this->is_mem = 1;
- }
- function __init() {
- parent::__init();
- $this->data = array();
- }
- /* */
- function isSetUp() {
- return 1;
- }
-
- function setUp() {}
-
- /* */
-
- function reset() {
- $this->data = array();
- }
-
- function drop() {
- $this->reset();
- }
- /* */
- function insert($doc, $g = 'http://localhost/') {
- $index = $this->v($g, array(), $this->data);
- $this->data[$g] = ARC2::getMergedIndex($index, $this->toIndex($doc));
- }
-
- /* */
- /* */
-
- function delete($doc, $g = 'http://localhost/') {
- $index = $this->v($g, array(), $this->data);
- $this->data[$g] = ARC2::getCleanedIndex($index, $this->toIndex($doc));
- }
- function replace($doc, $g, $doc_2) {
- return array($this->delete($doc, $g), $this->insert($doc_2, $g));
- }
-
- /* */
-
- function query($q, $result_format = '', $src = '', $keep_bnode_ids = 0, $log_query = 0) {
- if ($log_query) $this->logQuery($q);
- ARC2::inc('SPARQLPlusParser');
- $p = & new ARC2_SPARQLPlusParser($this->a, $this);
- $p->parse($q, $src);
- $infos = $p->getQueryInfos();
- $t1 = ARC2::mtime();
- if (!$errs = $p->getErrors()) {
- $qt = $infos['query']['type'];
- $r = array('query_type' => $qt, 'result' => $this->runQuery($q, $qt));
- }
- else {
- $r = array('result' => '');
- }
- $t2 = ARC2::mtime();
- $r['query_time'] = $t2 - $t1;
- /* query result */
- if ($result_format == 'raw') {
- return $r['result'];
- }
- if ($result_format == 'rows') {
- return $this->v('rows', array(), $r['result']);
- }
- if ($result_format == 'row') {
- return $r['result']['rows'] ? $r['result']['rows'][0] : array();
- }
- return $r;
- }
- function runQuery($q, $qt = '') {
- /* ep */
- $ep = $this->v('remote_store_endpoint', 0, $this->a);
- if (!$ep) return false;
- /* prefixes */
- $ns = isset($this->a['ns']) ? $this->a['ns'] : array();
- $added_prefixes = array();
- $prologue = '';
- foreach ($ns as $k => $v) {
- $k = rtrim($k, ':');
- if (in_array($k, $added_prefixes)) continue;
- if (preg_match('/(^|\s)' . $k . ':/s', $q) && !preg_match('/PREFIX\s+' . $k . '\:/is', $q)) {
- $prologue .= "\n" . 'PREFIX ' . $k . ': <' . $v . '>';
- }
- $added_prefixes[] = $k;
- }
- $q = $prologue . "\n" . $q;
- /* http verb */
- $mthd = in_array($qt, array('load', 'insert', 'delete')) ? 'POST' : 'GET';
- /* reader */
- ARC2::inc('Reader');
- $reader =& new ARC2_Reader($this->a, $this);
- $reader->setAcceptHeader('Accept: application/sparql-results+xml; q=0.9, application/rdf+xml; q=0.9, */*; q=0.1');
- if ($mthd == 'GET') {
- $url = $ep;
- $url .= strpos($ep, '?') ? '&' : '?';
- $url .= 'query=' . urlencode($q);
- if ($k = $this->v('store_read_key', '', $this->a)) $url .= '&key=' . urlencode($k);
- }
- else {
- $url = $ep;
- $reader->setHTTPMethod($mthd);
- $reader->setCustomHeaders("Content-Type: application/x-www-form-urlencoded");
- $suffix = ($k = $this->v('store_write_key', '', $this->a)) ? '&key=' . rawurlencode($k) : '';
- $reader->setMessageBody('query=' . rawurlencode($q) . $suffix);
- }
- $to = $this->v('remote_store_timeout', 0, $this->a);
- $reader->activate($url, '', 0, $to);
- $format = $reader->getFormat();
- $resp = '';
- while ($d = $reader->readStream()) {
- $resp .= $d;
- }
- $reader->closeStream();
- $ers = $reader->getErrors();
- unset($this->reader);
- if ($ers) return array('errors' => $ers);
- $mappings = array('rdfxml' => 'RDFXML', 'sparqlxml' => 'SPARQLXMLResult', 'turtle' => 'Turtle');
- if (!$format || !isset($mappings[$format])) {
- return $resp;
- //return $this->addError('No parser available for "' . $format . '" SPARQL result');
- }
- /* format parser */
- $suffix = $mappings[$format] . 'Parser';
- ARC2::inc($suffix);
- $cls = 'ARC2_' . $suffix;
- $parser =& new $cls($this->a, $this);
- $parser->parse($ep, $resp);
- /* ask|load|insert|delete */
- if (in_array($qt, array('ask', 'load', 'insert', 'delete'))) {
- $bid = $parser->getBooleanInsertedDeleted();
- switch ($qt) {
- case 'ask': return $bid['boolean'];
- default: return $bid;
- }
- }
- /* select */
- if (($qt == 'select') && !method_exists($parser, 'getRows')) return $resp;
- if ($qt == 'select') return array('rows' => $parser->getRows(), 'variables' => $parser->getVariables());
- /* any other */
- return $parser->getSimpleIndex(0);
- }
-
- /* */
-
- function optimizeTables() {}
-
- /* */
- function getResourceLabel($res, $unnamed_label = 'An unnamed resource') {
- if (!isset($this->resource_labels)) $this->resource_labels = array();
- if (isset($this->resource_labels[$res])) return $this->resource_labels[$res];
- if (!preg_match('/^[a-z0-9\_]+\:[^\s]+$/si', $res)) return $res;/* literal */
- $r = '';
- if (preg_match('/^\_\:/', $res)) {
- return $unnamed_label;
- }
- $row = $this->query('SELECT ?o WHERE { <' . $res . '> ?p ?o . FILTER(REGEX(str(?p), "(label|name)$", "i"))}', 'row');
- if ($row) {
- $r = $row['o'];
- }
- else {
- $r = preg_replace("/^(.*[\/\#])([^\/\#]+)$/", '\\2', str_replace('#self', '', $res));
- $r = str_replace('_', ' ', $r);
- $r = preg_replace('/([a-z])([A-Z])/e', '"\\1 " . strtolower("\\2")', $r);
- }
- $this->resource_labels[$res] = $r;
- return $r;
- }
- }